Simple Node Server

application.html

<script>
  let data = { postMessage: "Hello Postworld" };

  fetch("/api/posting", {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify(data),
  }).then(async (res) => {
    console.log(res);
    console.log("response:", await res.json());
  });

  fetch("/api/getting", {
    method: "GET",
    headers: { "Content-Type": "application/json" },
  }).then(async (res) => {
    console.log(res);
    console.log("response:", await res.json());
  });
</script>

server.js

const http = require("http");
var fs = require("fs");

const PORT = process.env.PORT || 8080;

const getReqData = (req) => {
  return new Promise((resolve, reject) => {
    try {
      let body = "";
      req.on("data", (chunk) => {
        body += chunk.toString();
      });
      req.on("end", () => {
        resolve(body);
      });
    } catch (error) {
      reject(error);
    }
  });
};

const serveFile = (filePath, res) => {
  fs.readFile(__dirname + filePath, (err, data) => {
    if (err) {
      res.writeHead(404);
      res.end(JSON.stringify(err));
      return;
    }
    res.writeHead(200);
    res.end(data);
  });
};

const server = http.createServer(async (req, res) => {
  if (req.url === "/" && req.method === "GET") {
    // APPLICATION.HTML
    return serveFile("/application.html", res);
  }

  if (req.url === "/api/getting" && req.method === "GET") {
    // GETTING
    res.writeHead(200, { "Content-Type": "application/json" });
    return res.end(JSON.stringify({ getMessage: "Hello Getworld" }));
  }

  if (req.url === "/api/posting" && req.method === "POST") {
    // POSTING
    const post_data = await getReqData(req);
    console.log(JSON.parse(post_data));
    res.writeHead(200, { "Content-Type": "application/json" });
    return res.end(post_data);
  }

  // NOT FOUND
  res.writeHead(404, { "Content-Type": "application/json" });
  res.end(JSON.stringify({ message: "Route not found" }));
});

server.listen(PORT, () => {
  console.log(`server started on port: ${PORT}`);
});

URLS

https://www.digitalocean.com/community/tutorials/how-to-install-node-js-on-ubuntu-20-04

https://www.howtogeek.com/261383/how-to-access-your-ubuntu-bash-files-in-windows-and-your-windows-system-drive-in-bash/